Lancashire Boiler

Working Of Lancashire boilerIn Lancashire boiler fuel is added into the grate of the boiler and burning of this make gases hot. These hot gases start their motion from grate section and enter in the fire tube of the boiler. Hot gases enter at the front section of the boiler and leave the boiler from the back and enter the bottom fuel and start moving toward the front section of the boiler. At front section hot gases leave the bottom flue and enter in side flue and move again toward the back of the boiler and enter the main outlet there.

Application of Lancashire BoilerLancashire Boilers are used to driveSteam turbinesMarinesLocomotivesLancashire Boilers are used in industries as processing agenttextile industrypaper industrysugar industrytire industrychemical industrybreweries industry

Advantages of Lancashire BoilerLancashire Boiler is an Economical boilerIt can be easily operatedCompactnessPortabilitySimple designEasy constructionHave low maintenance costHigh overall efficiency (70% to 75%)Steam produce have excellent qualityBy use of economizer and supper heater, maximum heat of flue gases is utilized efficiency of boiler can be increased.Disadvantages Lancashire BoilerCorrosion in water legsIt is difficult to clean insideLow steam production rate (9000kg/hr)Horizontal structure cover more ground spaceMaintenance of brick work is tedious.Have limited grate area because the fire tubes have small diameter.Its a low pressure Boiler maximum limit is only 18-20 barsLess number of tubesParts of Lancashire BoilerSafety valveSafety valve is used to release the pressure when it crosses the safety limits of the boilerBottom flueFlue present at the bottom of the shell and take the hot gases from the front to back of the boilerSide flueFlue present at both sides of the shell and take hot gases from the back to the main outlet of the boiler

Low water alarmAlarm which inform us when water level is low than safety lineDampersFlow of gases from side flues to the chimney is controlled by the sliding doors located at the end of side flueBlow-off clockFor the removal of mud and sedimentsParts of Lancashire Boiler

Figures for Lancashire boiler

Working Of Lancashire boilerThere is 85% heat transfer when hot gases are in fire tube and 15% when they are in bottom and side flue. Pressure range of the boiler is about 0.7 MPa to 2 MPa and efficiency is 65 to 70%. Dimension of the boiler depends on the dimension of the shell which is 2 to 3 m is diameter and 6 to 10 m in length.

CapacitySmallLargeDimensions5.5 m long x 2 m diameter9 m long x 3 m diameterOutput1500 kg/h6500 kg/hPressureUp to 12 bar gUp to 12 bar g?Thank You